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Conclusion
Through the period ofa century and a half, the North American continent was settled by descendants ofEuropeans, Asians, andAfricans, addingto the lightconcentrations ofNative Americans and the Spanish in California. Modern cities were started. Travel becameless hazardous. Environments changed. In the City of Sacramento, levees and downtown streets were raised, the American River diverted and foothill dams constructed to hold back excess rain and meltingsnow. Floods, aswell asmosquitoes,werecontrolled. Immunizations, the use of“miracle drugs,” and the developmentoftechnologieseliminatedtheoldepidemics. Morbidity andmortalitystatisticsimproveddramaticallyandlifespans grew longer. The primitive establishments of disease and death had evolved into hospitals ofhealth and new life.